1 #ifndef _LINUX_SCHED_H
2 #define _LINUX_SCHED_H
3
4 /*
5 * cloning flags:
6 */
7 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
9 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15 #define CLONE_THREAD 0x00010000 /* Same thread group? */
16 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
17 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
25 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
26 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
27 #define CLONE_NEWUSER 0x10000000 /* New user namespace */
28 #define CLONE_NEWPID 0x20000000 /* New pid namespace */
29 #define CLONE_NEWNET 0x40000000 /* New network namespace */
30 #define CLONE_IO 0x80000000 /* Clone io context */
31
32 /*
33 * Scheduling policies
34 */
35 #define SCHED_NORMAL 0
36 #define SCHED_FIFO 1
37 #define SCHED_RR 2
38 #define SCHED_BATCH 3
39 /* SCHED_ISO: reserved but not implemented yet */
40 #define SCHED_IDLE 5
41
42 #ifdef __KERNEL__
43
44 struct sched_param {
45 int sched_priority;
46 };
47
48 #include <asm/param.h> /* for HZ */
49
50 #include <linux/capability.h>
51 #include <linux/threads.h>
52 #include <linux/kernel.h>
53 #include <linux/types.h>
54 #include <linux/timex.h>
55 #include <linux/jiffies.h>
56 #include <linux/rbtree.h>
57 #include <linux/thread_info.h>
58 #include <linux/cpumask.h>
59 #include <linux/errno.h>
60 #include <linux/nodemask.h>
61 #include <linux/mm_types.h>
62
63 #include <asm/system.h>
64 #include <asm/page.h>
65 #include <asm/ptrace.h>
66 #include <asm/cputime.h>
67
68 #include <linux/smp.h>
69 #include <linux/sem.h>
70 #include <linux/signal.h>
71 #include <linux/fs_struct.h>
72 #include <linux/compiler.h>
73 #include <linux/completion.h>
74 #include <linux/pid.h>
75 #include <linux/percpu.h>
76 #include <linux/topology.h>
77 #include <linux/proportions.h>
78 #include <linux/seccomp.h>
79 #include <linux/rcupdate.h>
80 #include <linux/rtmutex.h>
81
82 #include <linux/time.h>
83 #include <linux/param.h>
84 #include <linux/resource.h>
85 #include <linux/timer.h>
86 #include <linux/hrtimer.h>
87 #include <linux/task_io_accounting.h>
88 #include <linux/kobject.h>
89 #include <linux/latencytop.h>
90 #include <linux/cred.h>
91
92 #include <asm/processor.h>
93
94 struct mem_cgroup;
95 struct exec_domain;
96 struct futex_pi_state;
97 struct robust_list_head;
98 struct bio;
99 struct bts_tracer;
100
101 /*
102 * List of flags we want to share for kernel threads,
103 * if only because they are not used by them anyway.
104 */
105 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
106
107 /*
108 * These are the constant used to fake the fixed-point load-average
109 * counting. Some notes:
110 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
111 * a load-average precision of 10 bits integer + 11 bits fractional
112 * - if you want to count load-averages more often, you need more
113 * precision, or rounding will get you. With 2-second counting freq,
114 * the EXP_n values would be 1981, 2034 and 2043 if still using only
115 * 11 bit fractions.
116 */
117 extern unsigned long avenrun[]; /* Load averages */
118
119 #define FSHIFT 11 /* nr of bits of precision */
120 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
121 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
122 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
123 #define EXP_5 2014 /* 1/exp(5sec/5min) */
124 #define EXP_15 2037 /* 1/exp(5sec/15min) */
125
126 #define CALC_LOAD(load,exp,n) \
127 load *= exp; \
128 load += n*(FIXED_1-exp); \
129 load >>= FSHIFT;
130
131 extern unsigned long total_forks;
132 extern int nr_threads;
133 DECLARE_PER_CPU(unsigned long, process_counts);
134 extern int nr_processes(void);
135 extern unsigned long nr_running(void);
136 extern unsigned long nr_uninterruptible(void);
137 extern unsigned long nr_active(void);
138 extern unsigned long nr_iowait(void);
139
140 struct seq_file;
141 struct cfs_rq;
142 struct task_group;
143 #ifdef CONFIG_SCHED_DEBUG
144 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
145 extern void proc_sched_set_task(struct task_struct *p);
146 extern void
147 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
148 #else
149 static inline void
proc_sched_show_task(struct task_struct * p,struct seq_file * m)150 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
151 {
152 }
proc_sched_set_task(struct task_struct * p)153 static inline void proc_sched_set_task(struct task_struct *p)
154 {
155 }
156 static inline void
print_cfs_rq(struct seq_file * m,int cpu,struct cfs_rq * cfs_rq)157 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
158 {
159 }
160 #endif
161
162 extern unsigned long long time_sync_thresh;
163
164 /*
165 * Task state bitmask. NOTE! These bits are also
166 * encoded in fs/proc/array.c: get_task_state().
167 *
168 * We have two separate sets of flags: task->state
169 * is about runnability, while task->exit_state are
170 * about the task exiting. Confusing, but this way
171 * modifying one set can't modify the other one by
172 * mistake.
173 */
174 #define TASK_RUNNING 0
175 #define TASK_INTERRUPTIBLE 1
176 #define TASK_UNINTERRUPTIBLE 2
177 #define __TASK_STOPPED 4
178 #define __TASK_TRACED 8
179 /* in tsk->exit_state */
180 #define EXIT_ZOMBIE 16
181 #define EXIT_DEAD 32
182 /* in tsk->state again */
183 #define TASK_DEAD 64
184 #define TASK_WAKEKILL 128
185
186 /* Convenience macros for the sake of set_task_state */
187 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
188 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
189 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
190
191 /* Convenience macros for the sake of wake_up */
192 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
193 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
194
195 /* get_task_state() */
196 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
197 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
198 __TASK_TRACED)
199
200 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
201 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
202 #define task_is_stopped_or_traced(task) \
203 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
204 #define task_contributes_to_load(task) \
205 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
206
207 #define __set_task_state(tsk, state_value) \
208 do { (tsk)->state = (state_value); } while (0)
209 #define set_task_state(tsk, state_value) \
210 set_mb((tsk)->state, (state_value))
211
212 /*
213 * set_current_state() includes a barrier so that the write of current->state
214 * is correctly serialised wrt the caller's subsequent test of whether to
215 * actually sleep:
216 *
217 * set_current_state(TASK_UNINTERRUPTIBLE);
218 * if (do_i_need_to_sleep())
219 * schedule();
220 *
221 * If the caller does not need such serialisation then use __set_current_state()
222 */
223 #define __set_current_state(state_value) \
224 do { current->state = (state_value); } while (0)
225 #define set_current_state(state_value) \
226 set_mb(current->state, (state_value))
227
228 /* Task command name length */
229 #define TASK_COMM_LEN 16
230
231 #include <linux/spinlock.h>
232
233 /*
234 * This serializes "schedule()" and also protects
235 * the run-queue from deletions/modifications (but
236 * _adding_ to the beginning of the run-queue has
237 * a separate lock).
238 */
239 extern rwlock_t tasklist_lock;
240 extern spinlock_t mmlist_lock;
241
242 struct task_struct;
243
244 extern void sched_init(void);
245 extern void sched_init_smp(void);
246 extern asmlinkage void schedule_tail(struct task_struct *prev);
247 extern void init_idle(struct task_struct *idle, int cpu);
248 extern void init_idle_bootup_task(struct task_struct *idle);
249
250 extern int runqueue_is_locked(void);
251 extern void task_rq_unlock_wait(struct task_struct *p);
252
253 extern cpumask_var_t nohz_cpu_mask;
254 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
255 extern int select_nohz_load_balancer(int cpu);
256 #else
select_nohz_load_balancer(int cpu)257 static inline int select_nohz_load_balancer(int cpu)
258 {
259 return 0;
260 }
261 #endif
262
263 /*
264 * Only dump TASK_* tasks. (0 for all tasks)
265 */
266 extern void show_state_filter(unsigned long state_filter);
267
show_state(void)268 static inline void show_state(void)
269 {
270 show_state_filter(0);
271 }
272
273 extern void show_regs(struct pt_regs *);
274
275 /*
276 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
277 * task), SP is the stack pointer of the first frame that should be shown in the back
278 * trace (or NULL if the entire call-chain of the task should be shown).
279 */
280 extern void show_stack(struct task_struct *task, unsigned long *sp);
281
282 void io_schedule(void);
283 long io_schedule_timeout(long timeout);
284
285 extern void cpu_init (void);
286 extern void trap_init(void);
287 extern void update_process_times(int user);
288 extern void scheduler_tick(void);
289
290 extern void sched_show_task(struct task_struct *p);
291
292 #ifdef CONFIG_DETECT_SOFTLOCKUP
293 extern void softlockup_tick(void);
294 extern void touch_softlockup_watchdog(void);
295 extern void touch_all_softlockup_watchdogs(void);
296 extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
297 struct file *filp, void __user *buffer,
298 size_t *lenp, loff_t *ppos);
299 extern unsigned int softlockup_panic;
300 extern unsigned long sysctl_hung_task_check_count;
301 extern unsigned long sysctl_hung_task_timeout_secs;
302 extern unsigned long sysctl_hung_task_warnings;
303 extern int softlockup_thresh;
304 #else
softlockup_tick(void)305 static inline void softlockup_tick(void)
306 {
307 }
spawn_softlockup_task(void)308 static inline void spawn_softlockup_task(void)
309 {
310 }
touch_softlockup_watchdog(void)311 static inline void touch_softlockup_watchdog(void)
312 {
313 }
touch_all_softlockup_watchdogs(void)314 static inline void touch_all_softlockup_watchdogs(void)
315 {
316 }
317 #endif
318
319
320 /* Attach to any functions which should be ignored in wchan output. */
321 #define __sched __attribute__((__section__(".sched.text")))
322
323 /* Linker adds these: start and end of __sched functions */
324 extern char __sched_text_start[], __sched_text_end[];
325
326 /* Is this address in the __sched functions? */
327 extern int in_sched_functions(unsigned long addr);
328
329 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
330 extern signed long schedule_timeout(signed long timeout);
331 extern signed long schedule_timeout_interruptible(signed long timeout);
332 extern signed long schedule_timeout_killable(signed long timeout);
333 extern signed long schedule_timeout_uninterruptible(signed long timeout);
334 asmlinkage void schedule(void);
335
336 struct nsproxy;
337 struct user_namespace;
338
339 /* Maximum number of active map areas.. This is a random (large) number */
340 #define DEFAULT_MAX_MAP_COUNT 65536
341
342 extern int sysctl_max_map_count;
343
344 #include <linux/aio.h>
345
346 extern unsigned long
347 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
348 unsigned long, unsigned long);
349 extern unsigned long
350 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
351 unsigned long len, unsigned long pgoff,
352 unsigned long flags);
353 extern void arch_unmap_area(struct mm_struct *, unsigned long);
354 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
355
356 #if USE_SPLIT_PTLOCKS
357 /*
358 * The mm counters are not protected by its page_table_lock,
359 * so must be incremented atomically.
360 */
361 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
362 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
363 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
364 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
365 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
366
367 #else /* !USE_SPLIT_PTLOCKS */
368 /*
369 * The mm counters are protected by its page_table_lock,
370 * so can be incremented directly.
371 */
372 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
373 #define get_mm_counter(mm, member) ((mm)->_##member)
374 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
375 #define inc_mm_counter(mm, member) (mm)->_##member++
376 #define dec_mm_counter(mm, member) (mm)->_##member--
377
378 #endif /* !USE_SPLIT_PTLOCKS */
379
380 #define get_mm_rss(mm) \
381 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
382 #define update_hiwater_rss(mm) do { \
383 unsigned long _rss = get_mm_rss(mm); \
384 if ((mm)->hiwater_rss < _rss) \
385 (mm)->hiwater_rss = _rss; \
386 } while (0)
387 #define update_hiwater_vm(mm) do { \
388 if ((mm)->hiwater_vm < (mm)->total_vm) \
389 (mm)->hiwater_vm = (mm)->total_vm; \
390 } while (0)
391
392 #define get_mm_hiwater_rss(mm) max((mm)->hiwater_rss, get_mm_rss(mm))
393 #define get_mm_hiwater_vm(mm) max((mm)->hiwater_vm, (mm)->total_vm)
394
395 extern void set_dumpable(struct mm_struct *mm, int value);
396 extern int get_dumpable(struct mm_struct *mm);
397
398 /* mm flags */
399 /* dumpable bits */
400 #define MMF_DUMPABLE 0 /* core dump is permitted */
401 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
402 #define MMF_DUMPABLE_BITS 2
403
404 /* coredump filter bits */
405 #define MMF_DUMP_ANON_PRIVATE 2
406 #define MMF_DUMP_ANON_SHARED 3
407 #define MMF_DUMP_MAPPED_PRIVATE 4
408 #define MMF_DUMP_MAPPED_SHARED 5
409 #define MMF_DUMP_ELF_HEADERS 6
410 #define MMF_DUMP_HUGETLB_PRIVATE 7
411 #define MMF_DUMP_HUGETLB_SHARED 8
412 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
413 #define MMF_DUMP_FILTER_BITS 7
414 #define MMF_DUMP_FILTER_MASK \
415 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
416 #define MMF_DUMP_FILTER_DEFAULT \
417 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
418 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
419
420 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
421 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
422 #else
423 # define MMF_DUMP_MASK_DEFAULT_ELF 0
424 #endif
425
426 struct sighand_struct {
427 atomic_t count;
428 struct k_sigaction action[_NSIG];
429 spinlock_t siglock;
430 wait_queue_head_t signalfd_wqh;
431 };
432
433 struct pacct_struct {
434 int ac_flag;
435 long ac_exitcode;
436 unsigned long ac_mem;
437 cputime_t ac_utime, ac_stime;
438 unsigned long ac_minflt, ac_majflt;
439 };
440
441 /**
442 * struct task_cputime - collected CPU time counts
443 * @utime: time spent in user mode, in &cputime_t units
444 * @stime: time spent in kernel mode, in &cputime_t units
445 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
446 *
447 * This structure groups together three kinds of CPU time that are
448 * tracked for threads and thread groups. Most things considering
449 * CPU time want to group these counts together and treat all three
450 * of them in parallel.
451 */
452 struct task_cputime {
453 cputime_t utime;
454 cputime_t stime;
455 unsigned long long sum_exec_runtime;
456 };
457 /* Alternate field names when used to cache expirations. */
458 #define prof_exp stime
459 #define virt_exp utime
460 #define sched_exp sum_exec_runtime
461
462 #define INIT_CPUTIME \
463 (struct task_cputime) { \
464 .utime = cputime_zero, \
465 .stime = cputime_zero, \
466 .sum_exec_runtime = 0, \
467 }
468
469 /**
470 * struct thread_group_cputimer - thread group interval timer counts
471 * @cputime: thread group interval timers.
472 * @running: non-zero when there are timers running and
473 * @cputime receives updates.
474 * @lock: lock for fields in this struct.
475 *
476 * This structure contains the version of task_cputime, above, that is
477 * used for thread group CPU timer calculations.
478 */
479 struct thread_group_cputimer {
480 struct task_cputime cputime;
481 int running;
482 spinlock_t lock;
483 };
484
485 /*
486 * NOTE! "signal_struct" does not have it's own
487 * locking, because a shared signal_struct always
488 * implies a shared sighand_struct, so locking
489 * sighand_struct is always a proper superset of
490 * the locking of signal_struct.
491 */
492 struct signal_struct {
493 atomic_t count;
494 atomic_t live;
495
496 wait_queue_head_t wait_chldexit; /* for wait4() */
497
498 /* current thread group signal load-balancing target: */
499 struct task_struct *curr_target;
500
501 /* shared signal handling: */
502 struct sigpending shared_pending;
503
504 /* thread group exit support */
505 int group_exit_code;
506 /* overloaded:
507 * - notify group_exit_task when ->count is equal to notify_count
508 * - everyone except group_exit_task is stopped during signal delivery
509 * of fatal signals, group_exit_task processes the signal.
510 */
511 int notify_count;
512 struct task_struct *group_exit_task;
513
514 /* thread group stop support, overloads group_exit_code too */
515 int group_stop_count;
516 unsigned int flags; /* see SIGNAL_* flags below */
517
518 /* POSIX.1b Interval Timers */
519 struct list_head posix_timers;
520
521 /* ITIMER_REAL timer for the process */
522 struct hrtimer real_timer;
523 struct pid *leader_pid;
524 ktime_t it_real_incr;
525
526 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
527 cputime_t it_prof_expires, it_virt_expires;
528 cputime_t it_prof_incr, it_virt_incr;
529
530 /*
531 * Thread group totals for process CPU timers.
532 * See thread_group_cputimer(), et al, for details.
533 */
534 struct thread_group_cputimer cputimer;
535
536 /* Earliest-expiration cache. */
537 struct task_cputime cputime_expires;
538
539 struct list_head cpu_timers[3];
540
541 /* job control IDs */
542
543 /*
544 * pgrp and session fields are deprecated.
545 * use the task_session_Xnr and task_pgrp_Xnr routines below
546 */
547
548 union {
549 pid_t pgrp __deprecated;
550 pid_t __pgrp;
551 };
552
553 struct pid *tty_old_pgrp;
554
555 union {
556 pid_t session __deprecated;
557 pid_t __session;
558 };
559
560 /* boolean value for session group leader */
561 int leader;
562
563 struct tty_struct *tty; /* NULL if no tty */
564
565 /*
566 * Cumulative resource counters for dead threads in the group,
567 * and for reaped dead child processes forked by this group.
568 * Live threads maintain their own counters and add to these
569 * in __exit_signal, except for the group leader.
570 */
571 cputime_t utime, stime, cutime, cstime;
572 cputime_t gtime;
573 cputime_t cgtime;
574 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
575 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
576 unsigned long inblock, oublock, cinblock, coublock;
577 struct task_io_accounting ioac;
578
579 /*
580 * Cumulative ns of schedule CPU time fo dead threads in the
581 * group, not including a zombie group leader, (This only differs
582 * from jiffies_to_ns(utime + stime) if sched_clock uses something
583 * other than jiffies.)
584 */
585 unsigned long long sum_sched_runtime;
586
587 /*
588 * We don't bother to synchronize most readers of this at all,
589 * because there is no reader checking a limit that actually needs
590 * to get both rlim_cur and rlim_max atomically, and either one
591 * alone is a single word that can safely be read normally.
592 * getrlimit/setrlimit use task_lock(current->group_leader) to
593 * protect this instead of the siglock, because they really
594 * have no need to disable irqs.
595 */
596 struct rlimit rlim[RLIM_NLIMITS];
597
598 #ifdef CONFIG_BSD_PROCESS_ACCT
599 struct pacct_struct pacct; /* per-process accounting information */
600 #endif
601 #ifdef CONFIG_TASKSTATS
602 struct taskstats *stats;
603 #endif
604 #ifdef CONFIG_AUDIT
605 unsigned audit_tty;
606 struct tty_audit_buf *tty_audit_buf;
607 #endif
608 };
609
610 /* Context switch must be unlocked if interrupts are to be enabled */
611 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
612 # define __ARCH_WANT_UNLOCKED_CTXSW
613 #endif
614
615 /*
616 * Bits in flags field of signal_struct.
617 */
618 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
619 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
620 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
621 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
622 /*
623 * Pending notifications to parent.
624 */
625 #define SIGNAL_CLD_STOPPED 0x00000010
626 #define SIGNAL_CLD_CONTINUED 0x00000020
627 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
628
629 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
630
631 /* If true, all threads except ->group_exit_task have pending SIGKILL */
signal_group_exit(const struct signal_struct * sig)632 static inline int signal_group_exit(const struct signal_struct *sig)
633 {
634 return (sig->flags & SIGNAL_GROUP_EXIT) ||
635 (sig->group_exit_task != NULL);
636 }
637
638 /*
639 * Some day this will be a full-fledged user tracking system..
640 */
641 struct user_struct {
642 atomic_t __count; /* reference count */
643 atomic_t processes; /* How many processes does this user have? */
644 atomic_t files; /* How many open files does this user have? */
645 atomic_t sigpending; /* How many pending signals does this user have? */
646 #ifdef CONFIG_INOTIFY_USER
647 atomic_t inotify_watches; /* How many inotify watches does this user have? */
648 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
649 #endif
650 #ifdef CONFIG_EPOLL
651 atomic_t epoll_watches; /* The number of file descriptors currently watched */
652 #endif
653 #ifdef CONFIG_POSIX_MQUEUE
654 /* protected by mq_lock */
655 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
656 #endif
657 unsigned long locked_shm; /* How many pages of mlocked shm ? */
658
659 #ifdef CONFIG_KEYS
660 struct key *uid_keyring; /* UID specific keyring */
661 struct key *session_keyring; /* UID's default session keyring */
662 #endif
663
664 /* Hash table maintenance information */
665 struct hlist_node uidhash_node;
666 uid_t uid;
667 struct user_namespace *user_ns;
668
669 #ifdef CONFIG_USER_SCHED
670 struct task_group *tg;
671 #ifdef CONFIG_SYSFS
672 struct kobject kobj;
673 struct work_struct work;
674 #endif
675 #endif
676 };
677
678 extern int uids_sysfs_init(void);
679
680 extern struct user_struct *find_user(uid_t);
681
682 extern struct user_struct root_user;
683 #define INIT_USER (&root_user)
684
685
686 struct backing_dev_info;
687 struct reclaim_state;
688
689 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
690 struct sched_info {
691 /* cumulative counters */
692 unsigned long pcount; /* # of times run on this cpu */
693 unsigned long long run_delay; /* time spent waiting on a runqueue */
694
695 /* timestamps */
696 unsigned long long last_arrival,/* when we last ran on a cpu */
697 last_queued; /* when we were last queued to run */
698 #ifdef CONFIG_SCHEDSTATS
699 /* BKL stats */
700 unsigned int bkl_count;
701 #endif
702 };
703 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
704
705 #ifdef CONFIG_TASK_DELAY_ACCT
706 struct task_delay_info {
707 spinlock_t lock;
708 unsigned int flags; /* Private per-task flags */
709
710 /* For each stat XXX, add following, aligned appropriately
711 *
712 * struct timespec XXX_start, XXX_end;
713 * u64 XXX_delay;
714 * u32 XXX_count;
715 *
716 * Atomicity of updates to XXX_delay, XXX_count protected by
717 * single lock above (split into XXX_lock if contention is an issue).
718 */
719
720 /*
721 * XXX_count is incremented on every XXX operation, the delay
722 * associated with the operation is added to XXX_delay.
723 * XXX_delay contains the accumulated delay time in nanoseconds.
724 */
725 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
726 u64 blkio_delay; /* wait for sync block io completion */
727 u64 swapin_delay; /* wait for swapin block io completion */
728 u32 blkio_count; /* total count of the number of sync block */
729 /* io operations performed */
730 u32 swapin_count; /* total count of the number of swapin block */
731 /* io operations performed */
732
733 struct timespec freepages_start, freepages_end;
734 u64 freepages_delay; /* wait for memory reclaim */
735 u32 freepages_count; /* total count of memory reclaim */
736 };
737 #endif /* CONFIG_TASK_DELAY_ACCT */
738
sched_info_on(void)739 static inline int sched_info_on(void)
740 {
741 #ifdef CONFIG_SCHEDSTATS
742 return 1;
743 #elif defined(CONFIG_TASK_DELAY_ACCT)
744 extern int delayacct_on;
745 return delayacct_on;
746 #else
747 return 0;
748 #endif
749 }
750
751 enum cpu_idle_type {
752 CPU_IDLE,
753 CPU_NOT_IDLE,
754 CPU_NEWLY_IDLE,
755 CPU_MAX_IDLE_TYPES
756 };
757
758 /*
759 * sched-domains (multiprocessor balancing) declarations:
760 */
761
762 /*
763 * Increase resolution of nice-level calculations:
764 */
765 #define SCHED_LOAD_SHIFT 10
766 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
767
768 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
769
770 #ifdef CONFIG_SMP
771 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
772 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
773 #define SD_BALANCE_EXEC 4 /* Balance on exec */
774 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
775 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
776 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
777 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
778 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
779 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
780 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
781 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
782 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
783
784 enum powersavings_balance_level {
785 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
786 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
787 * first for long running threads
788 */
789 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
790 * cpu package for power savings
791 */
792 MAX_POWERSAVINGS_BALANCE_LEVELS
793 };
794
795 extern int sched_mc_power_savings, sched_smt_power_savings;
796
sd_balance_for_mc_power(void)797 static inline int sd_balance_for_mc_power(void)
798 {
799 if (sched_smt_power_savings)
800 return SD_POWERSAVINGS_BALANCE;
801
802 return 0;
803 }
804
sd_balance_for_package_power(void)805 static inline int sd_balance_for_package_power(void)
806 {
807 if (sched_mc_power_savings | sched_smt_power_savings)
808 return SD_POWERSAVINGS_BALANCE;
809
810 return 0;
811 }
812
813 /*
814 * Optimise SD flags for power savings:
815 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
816 * Keep default SD flags if sched_{smt,mc}_power_saving=0
817 */
818
sd_power_saving_flags(void)819 static inline int sd_power_saving_flags(void)
820 {
821 if (sched_mc_power_savings | sched_smt_power_savings)
822 return SD_BALANCE_NEWIDLE;
823
824 return 0;
825 }
826
827 struct sched_group {
828 struct sched_group *next; /* Must be a circular list */
829
830 /*
831 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
832 * single CPU. This is read only (except for setup, hotplug CPU).
833 * Note : Never change cpu_power without recompute its reciprocal
834 */
835 unsigned int __cpu_power;
836 /*
837 * reciprocal value of cpu_power to avoid expensive divides
838 * (see include/linux/reciprocal_div.h)
839 */
840 u32 reciprocal_cpu_power;
841
842 unsigned long cpumask[];
843 };
844
sched_group_cpus(struct sched_group * sg)845 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
846 {
847 return to_cpumask(sg->cpumask);
848 }
849
850 enum sched_domain_level {
851 SD_LV_NONE = 0,
852 SD_LV_SIBLING,
853 SD_LV_MC,
854 SD_LV_CPU,
855 SD_LV_NODE,
856 SD_LV_ALLNODES,
857 SD_LV_MAX
858 };
859
860 struct sched_domain_attr {
861 int relax_domain_level;
862 };
863
864 #define SD_ATTR_INIT (struct sched_domain_attr) { \
865 .relax_domain_level = -1, \
866 }
867
868 struct sched_domain {
869 /* These fields must be setup */
870 struct sched_domain *parent; /* top domain must be null terminated */
871 struct sched_domain *child; /* bottom domain must be null terminated */
872 struct sched_group *groups; /* the balancing groups of the domain */
873 unsigned long min_interval; /* Minimum balance interval ms */
874 unsigned long max_interval; /* Maximum balance interval ms */
875 unsigned int busy_factor; /* less balancing by factor if busy */
876 unsigned int imbalance_pct; /* No balance until over watermark */
877 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
878 unsigned int busy_idx;
879 unsigned int idle_idx;
880 unsigned int newidle_idx;
881 unsigned int wake_idx;
882 unsigned int forkexec_idx;
883 int flags; /* See SD_* */
884 enum sched_domain_level level;
885
886 /* Runtime fields. */
887 unsigned long last_balance; /* init to jiffies. units in jiffies */
888 unsigned int balance_interval; /* initialise to 1. units in ms. */
889 unsigned int nr_balance_failed; /* initialise to 0 */
890
891 u64 last_update;
892
893 #ifdef CONFIG_SCHEDSTATS
894 /* load_balance() stats */
895 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
896 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
897 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
898 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
899 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
900 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
901 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
902 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
903
904 /* Active load balancing */
905 unsigned int alb_count;
906 unsigned int alb_failed;
907 unsigned int alb_pushed;
908
909 /* SD_BALANCE_EXEC stats */
910 unsigned int sbe_count;
911 unsigned int sbe_balanced;
912 unsigned int sbe_pushed;
913
914 /* SD_BALANCE_FORK stats */
915 unsigned int sbf_count;
916 unsigned int sbf_balanced;
917 unsigned int sbf_pushed;
918
919 /* try_to_wake_up() stats */
920 unsigned int ttwu_wake_remote;
921 unsigned int ttwu_move_affine;
922 unsigned int ttwu_move_balance;
923 #endif
924 #ifdef CONFIG_SCHED_DEBUG
925 char *name;
926 #endif
927
928 /* span of all CPUs in this domain */
929 unsigned long span[];
930 };
931
sched_domain_span(struct sched_domain * sd)932 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
933 {
934 return to_cpumask(sd->span);
935 }
936
937 extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
938 struct sched_domain_attr *dattr_new);
939
940 /* Test a flag in parent sched domain */
test_sd_parent(struct sched_domain * sd,int flag)941 static inline int test_sd_parent(struct sched_domain *sd, int flag)
942 {
943 if (sd->parent && (sd->parent->flags & flag))
944 return 1;
945
946 return 0;
947 }
948
949 #else /* CONFIG_SMP */
950
951 struct sched_domain_attr;
952
953 static inline void
partition_sched_domains(int ndoms_new,struct cpumask * doms_new,struct sched_domain_attr * dattr_new)954 partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
955 struct sched_domain_attr *dattr_new)
956 {
957 }
958 #endif /* !CONFIG_SMP */
959
960 struct io_context; /* See blkdev.h */
961
962
963 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
964 extern void prefetch_stack(struct task_struct *t);
965 #else
prefetch_stack(struct task_struct * t)966 static inline void prefetch_stack(struct task_struct *t) { }
967 #endif
968
969 struct audit_context; /* See audit.c */
970 struct mempolicy;
971 struct pipe_inode_info;
972 struct uts_namespace;
973
974 struct rq;
975 struct sched_domain;
976
977 struct sched_class {
978 const struct sched_class *next;
979
980 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
981 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
982 void (*yield_task) (struct rq *rq);
983
984 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
985
986 struct task_struct * (*pick_next_task) (struct rq *rq);
987 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
988
989 #ifdef CONFIG_SMP
990 int (*select_task_rq)(struct task_struct *p, int sync);
991
992 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
993 struct rq *busiest, unsigned long max_load_move,
994 struct sched_domain *sd, enum cpu_idle_type idle,
995 int *all_pinned, int *this_best_prio);
996
997 int (*move_one_task) (struct rq *this_rq, int this_cpu,
998 struct rq *busiest, struct sched_domain *sd,
999 enum cpu_idle_type idle);
1000 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1001 void (*post_schedule) (struct rq *this_rq);
1002 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
1003
1004 void (*set_cpus_allowed)(struct task_struct *p,
1005 const struct cpumask *newmask);
1006
1007 void (*rq_online)(struct rq *rq);
1008 void (*rq_offline)(struct rq *rq);
1009 #endif
1010
1011 void (*set_curr_task) (struct rq *rq);
1012 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1013 void (*task_new) (struct rq *rq, struct task_struct *p);
1014
1015 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1016 int running);
1017 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1018 int running);
1019 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1020 int oldprio, int running);
1021
1022 #ifdef CONFIG_FAIR_GROUP_SCHED
1023 void (*moved_group) (struct task_struct *p);
1024 #endif
1025 };
1026
1027 struct load_weight {
1028 unsigned long weight, inv_weight;
1029 };
1030
1031 /*
1032 * CFS stats for a schedulable entity (task, task-group etc)
1033 *
1034 * Current field usage histogram:
1035 *
1036 * 4 se->block_start
1037 * 4 se->run_node
1038 * 4 se->sleep_start
1039 * 6 se->load.weight
1040 */
1041 struct sched_entity {
1042 struct load_weight load; /* for load-balancing */
1043 struct rb_node run_node;
1044 struct list_head group_node;
1045 unsigned int on_rq;
1046
1047 u64 exec_start;
1048 u64 sum_exec_runtime;
1049 u64 vruntime;
1050 u64 prev_sum_exec_runtime;
1051
1052 u64 last_wakeup;
1053 u64 avg_overlap;
1054
1055 #ifdef CONFIG_SCHEDSTATS
1056 u64 wait_start;
1057 u64 wait_max;
1058 u64 wait_count;
1059 u64 wait_sum;
1060
1061 u64 sleep_start;
1062 u64 sleep_max;
1063 s64 sum_sleep_runtime;
1064
1065 u64 block_start;
1066 u64 block_max;
1067 u64 exec_max;
1068 u64 slice_max;
1069
1070 u64 nr_migrations;
1071 u64 nr_migrations_cold;
1072 u64 nr_failed_migrations_affine;
1073 u64 nr_failed_migrations_running;
1074 u64 nr_failed_migrations_hot;
1075 u64 nr_forced_migrations;
1076 u64 nr_forced2_migrations;
1077
1078 u64 nr_wakeups;
1079 u64 nr_wakeups_sync;
1080 u64 nr_wakeups_migrate;
1081 u64 nr_wakeups_local;
1082 u64 nr_wakeups_remote;
1083 u64 nr_wakeups_affine;
1084 u64 nr_wakeups_affine_attempts;
1085 u64 nr_wakeups_passive;
1086 u64 nr_wakeups_idle;
1087 #endif
1088
1089 #ifdef CONFIG_FAIR_GROUP_SCHED
1090 struct sched_entity *parent;
1091 /* rq on which this entity is (to be) queued: */
1092 struct cfs_rq *cfs_rq;
1093 /* rq "owned" by this entity/group: */
1094 struct cfs_rq *my_q;
1095 #endif
1096 };
1097
1098 struct sched_rt_entity {
1099 struct list_head run_list;
1100 unsigned long timeout;
1101 unsigned int time_slice;
1102 int nr_cpus_allowed;
1103
1104 struct sched_rt_entity *back;
1105 #ifdef CONFIG_RT_GROUP_SCHED
1106 struct sched_rt_entity *parent;
1107 /* rq on which this entity is (to be) queued: */
1108 struct rt_rq *rt_rq;
1109 /* rq "owned" by this entity/group: */
1110 struct rt_rq *my_q;
1111 #endif
1112 };
1113
1114 struct task_struct {
1115 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1116 void *stack;
1117 atomic_t usage;
1118 unsigned int flags; /* per process flags, defined below */
1119 unsigned int ptrace;
1120
1121 int lock_depth; /* BKL lock depth */
1122
1123 #ifdef CONFIG_SMP
1124 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1125 int oncpu;
1126 #endif
1127 #endif
1128
1129 int prio, static_prio, normal_prio;
1130 unsigned int rt_priority;
1131 const struct sched_class *sched_class;
1132 struct sched_entity se;
1133 struct sched_rt_entity rt;
1134
1135 #ifdef CONFIG_PREEMPT_NOTIFIERS
1136 /* list of struct preempt_notifier: */
1137 struct hlist_head preempt_notifiers;
1138 #endif
1139
1140 /*
1141 * fpu_counter contains the number of consecutive context switches
1142 * that the FPU is used. If this is over a threshold, the lazy fpu
1143 * saving becomes unlazy to save the trap. This is an unsigned char
1144 * so that after 256 times the counter wraps and the behavior turns
1145 * lazy again; this to deal with bursty apps that only use FPU for
1146 * a short time
1147 */
1148 unsigned char fpu_counter;
1149 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1150 #ifdef CONFIG_BLK_DEV_IO_TRACE
1151 unsigned int btrace_seq;
1152 #endif
1153
1154 unsigned int policy;
1155 cpumask_t cpus_allowed;
1156
1157 #ifdef CONFIG_PREEMPT_RCU
1158 int rcu_read_lock_nesting;
1159 int rcu_flipctr_idx;
1160 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1161
1162 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1163 struct sched_info sched_info;
1164 #endif
1165
1166 struct list_head tasks;
1167
1168 struct mm_struct *mm, *active_mm;
1169
1170 /* task state */
1171 struct linux_binfmt *binfmt;
1172 int exit_state;
1173 int exit_code, exit_signal;
1174 int pdeath_signal; /* The signal sent when the parent dies */
1175 /* ??? */
1176 unsigned int personality;
1177 unsigned did_exec:1;
1178 pid_t pid;
1179 pid_t tgid;
1180
1181 #ifdef CONFIG_CC_STACKPROTECTOR
1182 /* Canary value for the -fstack-protector gcc feature */
1183 unsigned long stack_canary;
1184 #endif
1185 /*
1186 * pointers to (original) parent process, youngest child, younger sibling,
1187 * older sibling, respectively. (p->father can be replaced with
1188 * p->real_parent->pid)
1189 */
1190 struct task_struct *real_parent; /* real parent process */
1191 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1192 /*
1193 * children/sibling forms the list of my natural children
1194 */
1195 struct list_head children; /* list of my children */
1196 struct list_head sibling; /* linkage in my parent's children list */
1197 struct task_struct *group_leader; /* threadgroup leader */
1198
1199 /*
1200 * ptraced is the list of tasks this task is using ptrace on.
1201 * This includes both natural children and PTRACE_ATTACH targets.
1202 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1203 */
1204 struct list_head ptraced;
1205 struct list_head ptrace_entry;
1206
1207 #ifdef CONFIG_X86_PTRACE_BTS
1208 /*
1209 * This is the tracer handle for the ptrace BTS extension.
1210 * This field actually belongs to the ptracer task.
1211 */
1212 struct bts_tracer *bts;
1213 /*
1214 * The buffer to hold the BTS data.
1215 */
1216 void *bts_buffer;
1217 size_t bts_size;
1218 #endif /* CONFIG_X86_PTRACE_BTS */
1219
1220 /* PID/PID hash table linkage. */
1221 struct pid_link pids[PIDTYPE_MAX];
1222 struct list_head thread_group;
1223
1224 struct completion *vfork_done; /* for vfork() */
1225 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1226 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1227
1228 cputime_t utime, stime, utimescaled, stimescaled;
1229 cputime_t gtime;
1230 cputime_t prev_utime, prev_stime;
1231 unsigned long nvcsw, nivcsw; /* context switch counts */
1232 struct timespec start_time; /* monotonic time */
1233 struct timespec real_start_time; /* boot based time */
1234 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1235 unsigned long min_flt, maj_flt;
1236
1237 struct task_cputime cputime_expires;
1238 struct list_head cpu_timers[3];
1239
1240 /* process credentials */
1241 const struct cred *real_cred; /* objective and real subjective task
1242 * credentials (COW) */
1243 const struct cred *cred; /* effective (overridable) subjective task
1244 * credentials (COW) */
1245 struct mutex cred_exec_mutex; /* execve vs ptrace cred calculation mutex */
1246
1247 char comm[TASK_COMM_LEN]; /* executable name excluding path
1248 - access with [gs]et_task_comm (which lock
1249 it with task_lock())
1250 - initialized normally by flush_old_exec */
1251 /* file system info */
1252 int link_count, total_link_count;
1253 #ifdef CONFIG_SYSVIPC
1254 /* ipc stuff */
1255 struct sysv_sem sysvsem;
1256 #endif
1257 #ifdef CONFIG_DETECT_SOFTLOCKUP
1258 /* hung task detection */
1259 unsigned long last_switch_timestamp;
1260 unsigned long last_switch_count;
1261 #endif
1262 /* CPU-specific state of this task */
1263 struct thread_struct thread;
1264 /* filesystem information */
1265 struct fs_struct *fs;
1266 /* open file information */
1267 struct files_struct *files;
1268 /* namespaces */
1269 struct nsproxy *nsproxy;
1270 /* signal handlers */
1271 struct signal_struct *signal;
1272 struct sighand_struct *sighand;
1273
1274 sigset_t blocked, real_blocked;
1275 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1276 struct sigpending pending;
1277
1278 unsigned long sas_ss_sp;
1279 size_t sas_ss_size;
1280 int (*notifier)(void *priv);
1281 void *notifier_data;
1282 sigset_t *notifier_mask;
1283 struct audit_context *audit_context;
1284 #ifdef CONFIG_AUDITSYSCALL
1285 uid_t loginuid;
1286 unsigned int sessionid;
1287 #endif
1288 seccomp_t seccomp;
1289
1290 /* Thread group tracking */
1291 u32 parent_exec_id;
1292 u32 self_exec_id;
1293 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1294 spinlock_t alloc_lock;
1295
1296 /* Protection of the PI data structures: */
1297 spinlock_t pi_lock;
1298
1299 #ifdef CONFIG_RT_MUTEXES
1300 /* PI waiters blocked on a rt_mutex held by this task */
1301 struct plist_head pi_waiters;
1302 /* Deadlock detection and priority inheritance handling */
1303 struct rt_mutex_waiter *pi_blocked_on;
1304 #endif
1305
1306 #ifdef CONFIG_DEBUG_MUTEXES
1307 /* mutex deadlock detection */
1308 struct mutex_waiter *blocked_on;
1309 #endif
1310 #ifdef CONFIG_TRACE_IRQFLAGS
1311 unsigned int irq_events;
1312 int hardirqs_enabled;
1313 unsigned long hardirq_enable_ip;
1314 unsigned int hardirq_enable_event;
1315 unsigned long hardirq_disable_ip;
1316 unsigned int hardirq_disable_event;
1317 int softirqs_enabled;
1318 unsigned long softirq_disable_ip;
1319 unsigned int softirq_disable_event;
1320 unsigned long softirq_enable_ip;
1321 unsigned int softirq_enable_event;
1322 int hardirq_context;
1323 int softirq_context;
1324 #endif
1325 #ifdef CONFIG_LOCKDEP
1326 # define MAX_LOCK_DEPTH 48UL
1327 u64 curr_chain_key;
1328 int lockdep_depth;
1329 unsigned int lockdep_recursion;
1330 struct held_lock held_locks[MAX_LOCK_DEPTH];
1331 #endif
1332
1333 /* journalling filesystem info */
1334 void *journal_info;
1335
1336 /* stacked block device info */
1337 struct bio *bio_list, **bio_tail;
1338
1339 /* VM state */
1340 struct reclaim_state *reclaim_state;
1341
1342 struct backing_dev_info *backing_dev_info;
1343
1344 struct io_context *io_context;
1345
1346 unsigned long ptrace_message;
1347 siginfo_t *last_siginfo; /* For ptrace use. */
1348 struct task_io_accounting ioac;
1349 #if defined(CONFIG_TASK_XACCT)
1350 u64 acct_rss_mem1; /* accumulated rss usage */
1351 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1352 cputime_t acct_timexpd; /* stime + utime since last update */
1353 #endif
1354 #ifdef CONFIG_CPUSETS
1355 nodemask_t mems_allowed;
1356 int cpuset_mems_generation;
1357 int cpuset_mem_spread_rotor;
1358 #endif
1359 #ifdef CONFIG_CGROUPS
1360 /* Control Group info protected by css_set_lock */
1361 struct css_set *cgroups;
1362 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1363 struct list_head cg_list;
1364 #endif
1365 #ifdef CONFIG_FUTEX
1366 struct robust_list_head __user *robust_list;
1367 #ifdef CONFIG_COMPAT
1368 struct compat_robust_list_head __user *compat_robust_list;
1369 #endif
1370 struct list_head pi_state_list;
1371 struct futex_pi_state *pi_state_cache;
1372 #endif
1373 #ifdef CONFIG_NUMA
1374 struct mempolicy *mempolicy;
1375 short il_next;
1376 #endif
1377 atomic_t fs_excl; /* holding fs exclusive resources */
1378 struct rcu_head rcu;
1379
1380 /*
1381 * cache last used pipe for splice
1382 */
1383 struct pipe_inode_info *splice_pipe;
1384 #ifdef CONFIG_TASK_DELAY_ACCT
1385 struct task_delay_info *delays;
1386 #endif
1387 #ifdef CONFIG_FAULT_INJECTION
1388 int make_it_fail;
1389 #endif
1390 struct prop_local_single dirties;
1391 #ifdef CONFIG_LATENCYTOP
1392 int latency_record_count;
1393 struct latency_record latency_record[LT_SAVECOUNT];
1394 #endif
1395 /*
1396 * time slack values; these are used to round up poll() and
1397 * select() etc timeout values. These are in nanoseconds.
1398 */
1399 unsigned long timer_slack_ns;
1400 unsigned long default_timer_slack_ns;
1401
1402 struct list_head *scm_work_list;
1403 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1404 /* Index of current stored adress in ret_stack */
1405 int curr_ret_stack;
1406 /* Stack of return addresses for return function tracing */
1407 struct ftrace_ret_stack *ret_stack;
1408 /*
1409 * Number of functions that haven't been traced
1410 * because of depth overrun.
1411 */
1412 atomic_t trace_overrun;
1413 /* Pause for the tracing */
1414 atomic_t tracing_graph_pause;
1415 #endif
1416 #ifdef CONFIG_TRACING
1417 /* state flags for use by tracers */
1418 unsigned long trace;
1419 #endif
1420 };
1421
1422 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1423 #define tsk_cpumask(tsk) (&(tsk)->cpus_allowed)
1424
1425 /*
1426 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1427 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1428 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1429 * values are inverted: lower p->prio value means higher priority.
1430 *
1431 * The MAX_USER_RT_PRIO value allows the actual maximum
1432 * RT priority to be separate from the value exported to
1433 * user-space. This allows kernel threads to set their
1434 * priority to a value higher than any user task. Note:
1435 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1436 */
1437
1438 #define MAX_USER_RT_PRIO 100
1439 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1440
1441 #define MAX_PRIO (MAX_RT_PRIO + 40)
1442 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1443
rt_prio(int prio)1444 static inline int rt_prio(int prio)
1445 {
1446 if (unlikely(prio < MAX_RT_PRIO))
1447 return 1;
1448 return 0;
1449 }
1450
rt_task(struct task_struct * p)1451 static inline int rt_task(struct task_struct *p)
1452 {
1453 return rt_prio(p->prio);
1454 }
1455
set_task_session(struct task_struct * tsk,pid_t session)1456 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1457 {
1458 tsk->signal->__session = session;
1459 }
1460
set_task_pgrp(struct task_struct * tsk,pid_t pgrp)1461 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1462 {
1463 tsk->signal->__pgrp = pgrp;
1464 }
1465
task_pid(struct task_struct * task)1466 static inline struct pid *task_pid(struct task_struct *task)
1467 {
1468 return task->pids[PIDTYPE_PID].pid;
1469 }
1470
task_tgid(struct task_struct * task)1471 static inline struct pid *task_tgid(struct task_struct *task)
1472 {
1473 return task->group_leader->pids[PIDTYPE_PID].pid;
1474 }
1475
task_pgrp(struct task_struct * task)1476 static inline struct pid *task_pgrp(struct task_struct *task)
1477 {
1478 return task->group_leader->pids[PIDTYPE_PGID].pid;
1479 }
1480
task_session(struct task_struct * task)1481 static inline struct pid *task_session(struct task_struct *task)
1482 {
1483 return task->group_leader->pids[PIDTYPE_SID].pid;
1484 }
1485
1486 struct pid_namespace;
1487
1488 /*
1489 * the helpers to get the task's different pids as they are seen
1490 * from various namespaces
1491 *
1492 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1493 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1494 * current.
1495 * task_xid_nr_ns() : id seen from the ns specified;
1496 *
1497 * set_task_vxid() : assigns a virtual id to a task;
1498 *
1499 * see also pid_nr() etc in include/linux/pid.h
1500 */
1501
task_pid_nr(struct task_struct * tsk)1502 static inline pid_t task_pid_nr(struct task_struct *tsk)
1503 {
1504 return tsk->pid;
1505 }
1506
1507 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1508
task_pid_vnr(struct task_struct * tsk)1509 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1510 {
1511 return pid_vnr(task_pid(tsk));
1512 }
1513
1514
task_tgid_nr(struct task_struct * tsk)1515 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1516 {
1517 return tsk->tgid;
1518 }
1519
1520 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1521
task_tgid_vnr(struct task_struct * tsk)1522 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1523 {
1524 return pid_vnr(task_tgid(tsk));
1525 }
1526
1527
task_pgrp_nr(struct task_struct * tsk)1528 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1529 {
1530 return tsk->signal->__pgrp;
1531 }
1532
1533 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1534
task_pgrp_vnr(struct task_struct * tsk)1535 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1536 {
1537 return pid_vnr(task_pgrp(tsk));
1538 }
1539
1540
task_session_nr(struct task_struct * tsk)1541 static inline pid_t task_session_nr(struct task_struct *tsk)
1542 {
1543 return tsk->signal->__session;
1544 }
1545
1546 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1547
task_session_vnr(struct task_struct * tsk)1548 static inline pid_t task_session_vnr(struct task_struct *tsk)
1549 {
1550 return pid_vnr(task_session(tsk));
1551 }
1552
1553
1554 /**
1555 * pid_alive - check that a task structure is not stale
1556 * @p: Task structure to be checked.
1557 *
1558 * Test if a process is not yet dead (at most zombie state)
1559 * If pid_alive fails, then pointers within the task structure
1560 * can be stale and must not be dereferenced.
1561 */
pid_alive(struct task_struct * p)1562 static inline int pid_alive(struct task_struct *p)
1563 {
1564 return p->pids[PIDTYPE_PID].pid != NULL;
1565 }
1566
1567 /**
1568 * is_global_init - check if a task structure is init
1569 * @tsk: Task structure to be checked.
1570 *
1571 * Check if a task structure is the first user space task the kernel created.
1572 */
is_global_init(struct task_struct * tsk)1573 static inline int is_global_init(struct task_struct *tsk)
1574 {
1575 return tsk->pid == 1;
1576 }
1577
1578 /*
1579 * is_container_init:
1580 * check whether in the task is init in its own pid namespace.
1581 */
1582 extern int is_container_init(struct task_struct *tsk);
1583
1584 extern struct pid *cad_pid;
1585
1586 extern void free_task(struct task_struct *tsk);
1587 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1588
1589 extern void __put_task_struct(struct task_struct *t);
1590
put_task_struct(struct task_struct * t)1591 static inline void put_task_struct(struct task_struct *t)
1592 {
1593 if (atomic_dec_and_test(&t->usage))
1594 __put_task_struct(t);
1595 }
1596
1597 extern cputime_t task_utime(struct task_struct *p);
1598 extern cputime_t task_stime(struct task_struct *p);
1599 extern cputime_t task_gtime(struct task_struct *p);
1600
1601 /*
1602 * Per process flags
1603 */
1604 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1605 /* Not implemented yet, only for 486*/
1606 #define PF_STARTING 0x00000002 /* being created */
1607 #define PF_EXITING 0x00000004 /* getting shut down */
1608 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1609 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1610 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1611 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1612 #define PF_DUMPCORE 0x00000200 /* dumped core */
1613 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1614 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1615 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1616 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1617 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1618 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1619 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1620 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1621 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1622 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1623 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1624 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1625 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1626 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1627 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1628 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1629 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1630 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1631 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1632 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1633
1634 /*
1635 * Only the _current_ task can read/write to tsk->flags, but other
1636 * tasks can access tsk->flags in readonly mode for example
1637 * with tsk_used_math (like during threaded core dumping).
1638 * There is however an exception to this rule during ptrace
1639 * or during fork: the ptracer task is allowed to write to the
1640 * child->flags of its traced child (same goes for fork, the parent
1641 * can write to the child->flags), because we're guaranteed the
1642 * child is not running and in turn not changing child->flags
1643 * at the same time the parent does it.
1644 */
1645 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1646 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1647 #define clear_used_math() clear_stopped_child_used_math(current)
1648 #define set_used_math() set_stopped_child_used_math(current)
1649 #define conditional_stopped_child_used_math(condition, child) \
1650 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1651 #define conditional_used_math(condition) \
1652 conditional_stopped_child_used_math(condition, current)
1653 #define copy_to_stopped_child_used_math(child) \
1654 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1655 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1656 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1657 #define used_math() tsk_used_math(current)
1658
1659 #ifdef CONFIG_SMP
1660 extern int set_cpus_allowed_ptr(struct task_struct *p,
1661 const struct cpumask *new_mask);
1662 #else
set_cpus_allowed_ptr(struct task_struct * p,const struct cpumask * new_mask)1663 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1664 const struct cpumask *new_mask)
1665 {
1666 if (!cpumask_test_cpu(0, new_mask))
1667 return -EINVAL;
1668 return 0;
1669 }
1670 #endif
set_cpus_allowed(struct task_struct * p,cpumask_t new_mask)1671 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1672 {
1673 return set_cpus_allowed_ptr(p, &new_mask);
1674 }
1675
1676 extern unsigned long long sched_clock(void);
1677
1678 extern void sched_clock_init(void);
1679 extern u64 sched_clock_cpu(int cpu);
1680
1681 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
sched_clock_tick(void)1682 static inline void sched_clock_tick(void)
1683 {
1684 }
1685
sched_clock_idle_sleep_event(void)1686 static inline void sched_clock_idle_sleep_event(void)
1687 {
1688 }
1689
sched_clock_idle_wakeup_event(u64 delta_ns)1690 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1691 {
1692 }
1693 #else
1694 extern void sched_clock_tick(void);
1695 extern void sched_clock_idle_sleep_event(void);
1696 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1697 #endif
1698
1699 /*
1700 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1701 * clock constructed from sched_clock():
1702 */
1703 extern unsigned long long cpu_clock(int cpu);
1704
1705 extern unsigned long long
1706 task_sched_runtime(struct task_struct *task);
1707 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1708
1709 /* sched_exec is called by processes performing an exec */
1710 #ifdef CONFIG_SMP
1711 extern void sched_exec(void);
1712 #else
1713 #define sched_exec() {}
1714 #endif
1715
1716 extern void sched_clock_idle_sleep_event(void);
1717 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1718
1719 #ifdef CONFIG_HOTPLUG_CPU
1720 extern void idle_task_exit(void);
1721 #else
idle_task_exit(void)1722 static inline void idle_task_exit(void) {}
1723 #endif
1724
1725 extern void sched_idle_next(void);
1726
1727 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1728 extern void wake_up_idle_cpu(int cpu);
1729 #else
wake_up_idle_cpu(int cpu)1730 static inline void wake_up_idle_cpu(int cpu) { }
1731 #endif
1732
1733 extern unsigned int sysctl_sched_latency;
1734 extern unsigned int sysctl_sched_min_granularity;
1735 extern unsigned int sysctl_sched_wakeup_granularity;
1736 extern unsigned int sysctl_sched_shares_ratelimit;
1737 extern unsigned int sysctl_sched_shares_thresh;
1738 #ifdef CONFIG_SCHED_DEBUG
1739 extern unsigned int sysctl_sched_child_runs_first;
1740 extern unsigned int sysctl_sched_features;
1741 extern unsigned int sysctl_sched_migration_cost;
1742 extern unsigned int sysctl_sched_nr_migrate;
1743
1744 int sched_nr_latency_handler(struct ctl_table *table, int write,
1745 struct file *file, void __user *buffer, size_t *length,
1746 loff_t *ppos);
1747 #endif
1748 extern unsigned int sysctl_sched_rt_period;
1749 extern int sysctl_sched_rt_runtime;
1750
1751 int sched_rt_handler(struct ctl_table *table, int write,
1752 struct file *filp, void __user *buffer, size_t *lenp,
1753 loff_t *ppos);
1754
1755 extern unsigned int sysctl_sched_compat_yield;
1756
1757 #ifdef CONFIG_RT_MUTEXES
1758 extern int rt_mutex_getprio(struct task_struct *p);
1759 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1760 extern void rt_mutex_adjust_pi(struct task_struct *p);
1761 #else
rt_mutex_getprio(struct task_struct * p)1762 static inline int rt_mutex_getprio(struct task_struct *p)
1763 {
1764 return p->normal_prio;
1765 }
1766 # define rt_mutex_adjust_pi(p) do { } while (0)
1767 #endif
1768
1769 extern void set_user_nice(struct task_struct *p, long nice);
1770 extern int task_prio(const struct task_struct *p);
1771 extern int task_nice(const struct task_struct *p);
1772 extern int can_nice(const struct task_struct *p, const int nice);
1773 extern int task_curr(const struct task_struct *p);
1774 extern int idle_cpu(int cpu);
1775 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1776 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1777 struct sched_param *);
1778 extern struct task_struct *idle_task(int cpu);
1779 extern struct task_struct *curr_task(int cpu);
1780 extern void set_curr_task(int cpu, struct task_struct *p);
1781
1782 void yield(void);
1783
1784 /*
1785 * The default (Linux) execution domain.
1786 */
1787 extern struct exec_domain default_exec_domain;
1788
1789 union thread_union {
1790 struct thread_info thread_info;
1791 unsigned long stack[THREAD_SIZE/sizeof(long)];
1792 };
1793
1794 #ifndef __HAVE_ARCH_KSTACK_END
kstack_end(void * addr)1795 static inline int kstack_end(void *addr)
1796 {
1797 /* Reliable end of stack detection:
1798 * Some APM bios versions misalign the stack
1799 */
1800 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1801 }
1802 #endif
1803
1804 extern union thread_union init_thread_union;
1805 extern struct task_struct init_task;
1806
1807 extern struct mm_struct init_mm;
1808
1809 extern struct pid_namespace init_pid_ns;
1810
1811 /*
1812 * find a task by one of its numerical ids
1813 *
1814 * find_task_by_pid_type_ns():
1815 * it is the most generic call - it finds a task by all id,
1816 * type and namespace specified
1817 * find_task_by_pid_ns():
1818 * finds a task by its pid in the specified namespace
1819 * find_task_by_vpid():
1820 * finds a task by its virtual pid
1821 *
1822 * see also find_vpid() etc in include/linux/pid.h
1823 */
1824
1825 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1826 struct pid_namespace *ns);
1827
1828 extern struct task_struct *find_task_by_vpid(pid_t nr);
1829 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1830 struct pid_namespace *ns);
1831
1832 extern void __set_special_pids(struct pid *pid);
1833
1834 /* per-UID process charging. */
1835 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
get_uid(struct user_struct * u)1836 static inline struct user_struct *get_uid(struct user_struct *u)
1837 {
1838 atomic_inc(&u->__count);
1839 return u;
1840 }
1841 extern void free_uid(struct user_struct *);
1842 extern void release_uids(struct user_namespace *ns);
1843
1844 #include <asm/current.h>
1845
1846 extern void do_timer(unsigned long ticks);
1847
1848 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1849 extern int wake_up_process(struct task_struct *tsk);
1850 extern void wake_up_new_task(struct task_struct *tsk,
1851 unsigned long clone_flags);
1852 #ifdef CONFIG_SMP
1853 extern void kick_process(struct task_struct *tsk);
1854 #else
kick_process(struct task_struct * tsk)1855 static inline void kick_process(struct task_struct *tsk) { }
1856 #endif
1857 extern void sched_fork(struct task_struct *p, int clone_flags);
1858 extern void sched_dead(struct task_struct *p);
1859
1860 extern void proc_caches_init(void);
1861 extern void flush_signals(struct task_struct *);
1862 extern void ignore_signals(struct task_struct *);
1863 extern void flush_signal_handlers(struct task_struct *, int force_default);
1864 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1865
dequeue_signal_lock(struct task_struct * tsk,sigset_t * mask,siginfo_t * info)1866 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1867 {
1868 unsigned long flags;
1869 int ret;
1870
1871 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1872 ret = dequeue_signal(tsk, mask, info);
1873 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1874
1875 return ret;
1876 }
1877
1878 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1879 sigset_t *mask);
1880 extern void unblock_all_signals(void);
1881 extern void release_task(struct task_struct * p);
1882 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1883 extern int force_sigsegv(int, struct task_struct *);
1884 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1885 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1886 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1887 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1888 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1889 extern int kill_pid(struct pid *pid, int sig, int priv);
1890 extern int kill_proc_info(int, struct siginfo *, pid_t);
1891 extern int do_notify_parent(struct task_struct *, int);
1892 extern void force_sig(int, struct task_struct *);
1893 extern void force_sig_specific(int, struct task_struct *);
1894 extern int send_sig(int, struct task_struct *, int);
1895 extern void zap_other_threads(struct task_struct *p);
1896 extern struct sigqueue *sigqueue_alloc(void);
1897 extern void sigqueue_free(struct sigqueue *);
1898 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
1899 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1900 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1901
kill_cad_pid(int sig,int priv)1902 static inline int kill_cad_pid(int sig, int priv)
1903 {
1904 return kill_pid(cad_pid, sig, priv);
1905 }
1906
1907 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1908 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1909 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1910 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1911
is_si_special(const struct siginfo * info)1912 static inline int is_si_special(const struct siginfo *info)
1913 {
1914 return info <= SEND_SIG_FORCED;
1915 }
1916
1917 /* True if we are on the alternate signal stack. */
1918
on_sig_stack(unsigned long sp)1919 static inline int on_sig_stack(unsigned long sp)
1920 {
1921 return (sp - current->sas_ss_sp < current->sas_ss_size);
1922 }
1923
sas_ss_flags(unsigned long sp)1924 static inline int sas_ss_flags(unsigned long sp)
1925 {
1926 return (current->sas_ss_size == 0 ? SS_DISABLE
1927 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1928 }
1929
1930 /*
1931 * Routines for handling mm_structs
1932 */
1933 extern struct mm_struct * mm_alloc(void);
1934
1935 /* mmdrop drops the mm and the page tables */
1936 extern void __mmdrop(struct mm_struct *);
mmdrop(struct mm_struct * mm)1937 static inline void mmdrop(struct mm_struct * mm)
1938 {
1939 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1940 __mmdrop(mm);
1941 }
1942
1943 /* mmput gets rid of the mappings and all user-space */
1944 extern void mmput(struct mm_struct *);
1945 /* Grab a reference to a task's mm, if it is not already going away */
1946 extern struct mm_struct *get_task_mm(struct task_struct *task);
1947 /* Remove the current tasks stale references to the old mm_struct */
1948 extern void mm_release(struct task_struct *, struct mm_struct *);
1949 /* Allocate a new mm structure and copy contents from tsk->mm */
1950 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1951
1952 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1953 extern void flush_thread(void);
1954 extern void exit_thread(void);
1955
1956 extern void exit_files(struct task_struct *);
1957 extern void __cleanup_signal(struct signal_struct *);
1958 extern void __cleanup_sighand(struct sighand_struct *);
1959
1960 extern void exit_itimers(struct signal_struct *);
1961 extern void flush_itimer_signals(void);
1962
1963 extern NORET_TYPE void do_group_exit(int);
1964
1965 extern void daemonize(const char *, ...);
1966 extern int allow_signal(int);
1967 extern int disallow_signal(int);
1968
1969 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1970 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1971 struct task_struct *fork_idle(int);
1972
1973 extern void set_task_comm(struct task_struct *tsk, char *from);
1974 extern char *get_task_comm(char *to, struct task_struct *tsk);
1975
1976 #ifdef CONFIG_SMP
1977 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1978 #else
wait_task_inactive(struct task_struct * p,long match_state)1979 static inline unsigned long wait_task_inactive(struct task_struct *p,
1980 long match_state)
1981 {
1982 return 1;
1983 }
1984 #endif
1985
1986 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1987
1988 #define for_each_process(p) \
1989 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1990
1991 extern bool is_single_threaded(struct task_struct *);
1992
1993 /*
1994 * Careful: do_each_thread/while_each_thread is a double loop so
1995 * 'break' will not work as expected - use goto instead.
1996 */
1997 #define do_each_thread(g, t) \
1998 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1999
2000 #define while_each_thread(g, t) \
2001 while ((t = next_thread(t)) != g)
2002
2003 /* de_thread depends on thread_group_leader not being a pid based check */
2004 #define thread_group_leader(p) (p == p->group_leader)
2005
2006 /* Do to the insanities of de_thread it is possible for a process
2007 * to have the pid of the thread group leader without actually being
2008 * the thread group leader. For iteration through the pids in proc
2009 * all we care about is that we have a task with the appropriate
2010 * pid, we don't actually care if we have the right task.
2011 */
has_group_leader_pid(struct task_struct * p)2012 static inline int has_group_leader_pid(struct task_struct *p)
2013 {
2014 return p->pid == p->tgid;
2015 }
2016
2017 static inline
same_thread_group(struct task_struct * p1,struct task_struct * p2)2018 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2019 {
2020 return p1->tgid == p2->tgid;
2021 }
2022
next_thread(const struct task_struct * p)2023 static inline struct task_struct *next_thread(const struct task_struct *p)
2024 {
2025 return list_entry(rcu_dereference(p->thread_group.next),
2026 struct task_struct, thread_group);
2027 }
2028
thread_group_empty(struct task_struct * p)2029 static inline int thread_group_empty(struct task_struct *p)
2030 {
2031 return list_empty(&p->thread_group);
2032 }
2033
2034 #define delay_group_leader(p) \
2035 (thread_group_leader(p) && !thread_group_empty(p))
2036
2037 /*
2038 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2039 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2040 * pins the final release of task.io_context. Also protects ->cpuset and
2041 * ->cgroup.subsys[].
2042 *
2043 * Nests both inside and outside of read_lock(&tasklist_lock).
2044 * It must not be nested with write_lock_irq(&tasklist_lock),
2045 * neither inside nor outside.
2046 */
task_lock(struct task_struct * p)2047 static inline void task_lock(struct task_struct *p)
2048 {
2049 spin_lock(&p->alloc_lock);
2050 }
2051
task_unlock(struct task_struct * p)2052 static inline void task_unlock(struct task_struct *p)
2053 {
2054 spin_unlock(&p->alloc_lock);
2055 }
2056
2057 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2058 unsigned long *flags);
2059
unlock_task_sighand(struct task_struct * tsk,unsigned long * flags)2060 static inline void unlock_task_sighand(struct task_struct *tsk,
2061 unsigned long *flags)
2062 {
2063 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2064 }
2065
2066 #ifndef __HAVE_THREAD_FUNCTIONS
2067
2068 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2069 #define task_stack_page(task) ((task)->stack)
2070
setup_thread_stack(struct task_struct * p,struct task_struct * org)2071 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2072 {
2073 *task_thread_info(p) = *task_thread_info(org);
2074 task_thread_info(p)->task = p;
2075 }
2076
end_of_stack(struct task_struct * p)2077 static inline unsigned long *end_of_stack(struct task_struct *p)
2078 {
2079 return (unsigned long *)(task_thread_info(p) + 1);
2080 }
2081
2082 #endif
2083
object_is_on_stack(void * obj)2084 static inline int object_is_on_stack(void *obj)
2085 {
2086 void *stack = task_stack_page(current);
2087
2088 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2089 }
2090
2091 extern void thread_info_cache_init(void);
2092
2093 /* set thread flags in other task's structures
2094 * - see asm/thread_info.h for TIF_xxxx flags available
2095 */
set_tsk_thread_flag(struct task_struct * tsk,int flag)2096 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2097 {
2098 set_ti_thread_flag(task_thread_info(tsk), flag);
2099 }
2100
clear_tsk_thread_flag(struct task_struct * tsk,int flag)2101 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2102 {
2103 clear_ti_thread_flag(task_thread_info(tsk), flag);
2104 }
2105
test_and_set_tsk_thread_flag(struct task_struct * tsk,int flag)2106 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2107 {
2108 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2109 }
2110
test_and_clear_tsk_thread_flag(struct task_struct * tsk,int flag)2111 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2112 {
2113 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2114 }
2115
test_tsk_thread_flag(struct task_struct * tsk,int flag)2116 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2117 {
2118 return test_ti_thread_flag(task_thread_info(tsk), flag);
2119 }
2120
set_tsk_need_resched(struct task_struct * tsk)2121 static inline void set_tsk_need_resched(struct task_struct *tsk)
2122 {
2123 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2124 }
2125
clear_tsk_need_resched(struct task_struct * tsk)2126 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2127 {
2128 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2129 }
2130
test_tsk_need_resched(struct task_struct * tsk)2131 static inline int test_tsk_need_resched(struct task_struct *tsk)
2132 {
2133 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2134 }
2135
signal_pending(struct task_struct * p)2136 static inline int signal_pending(struct task_struct *p)
2137 {
2138 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2139 }
2140
2141 extern int __fatal_signal_pending(struct task_struct *p);
2142
fatal_signal_pending(struct task_struct * p)2143 static inline int fatal_signal_pending(struct task_struct *p)
2144 {
2145 return signal_pending(p) && __fatal_signal_pending(p);
2146 }
2147
signal_pending_state(long state,struct task_struct * p)2148 static inline int signal_pending_state(long state, struct task_struct *p)
2149 {
2150 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2151 return 0;
2152 if (!signal_pending(p))
2153 return 0;
2154
2155 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2156 }
2157
need_resched(void)2158 static inline int need_resched(void)
2159 {
2160 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2161 }
2162
2163 /*
2164 * cond_resched() and cond_resched_lock(): latency reduction via
2165 * explicit rescheduling in places that are safe. The return
2166 * value indicates whether a reschedule was done in fact.
2167 * cond_resched_lock() will drop the spinlock before scheduling,
2168 * cond_resched_softirq() will enable bhs before scheduling.
2169 */
2170 extern int _cond_resched(void);
2171 #ifdef CONFIG_PREEMPT_BKL
cond_resched(void)2172 static inline int cond_resched(void)
2173 {
2174 return 0;
2175 }
2176 #else
cond_resched(void)2177 static inline int cond_resched(void)
2178 {
2179 return _cond_resched();
2180 }
2181 #endif
2182 extern int cond_resched_lock(spinlock_t * lock);
2183 extern int cond_resched_softirq(void);
cond_resched_bkl(void)2184 static inline int cond_resched_bkl(void)
2185 {
2186 return _cond_resched();
2187 }
2188
2189 /*
2190 * Does a critical section need to be broken due to another
2191 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2192 * but a general need for low latency)
2193 */
spin_needbreak(spinlock_t * lock)2194 static inline int spin_needbreak(spinlock_t *lock)
2195 {
2196 #ifdef CONFIG_PREEMPT
2197 return spin_is_contended(lock);
2198 #else
2199 return 0;
2200 #endif
2201 }
2202
2203 /*
2204 * Thread group CPU time accounting.
2205 */
2206 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2207 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2208
thread_group_cputime_init(struct signal_struct * sig)2209 static inline void thread_group_cputime_init(struct signal_struct *sig)
2210 {
2211 sig->cputimer.cputime = INIT_CPUTIME;
2212 spin_lock_init(&sig->cputimer.lock);
2213 sig->cputimer.running = 0;
2214 }
2215
thread_group_cputime_free(struct signal_struct * sig)2216 static inline void thread_group_cputime_free(struct signal_struct *sig)
2217 {
2218 }
2219
2220 /*
2221 * Reevaluate whether the task has signals pending delivery.
2222 * Wake the task if so.
2223 * This is required every time the blocked sigset_t changes.
2224 * callers must hold sighand->siglock.
2225 */
2226 extern void recalc_sigpending_and_wake(struct task_struct *t);
2227 extern void recalc_sigpending(void);
2228
2229 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2230
2231 /*
2232 * Wrappers for p->thread_info->cpu access. No-op on UP.
2233 */
2234 #ifdef CONFIG_SMP
2235
task_cpu(const struct task_struct * p)2236 static inline unsigned int task_cpu(const struct task_struct *p)
2237 {
2238 return task_thread_info(p)->cpu;
2239 }
2240
2241 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2242
2243 #else
2244
task_cpu(const struct task_struct * p)2245 static inline unsigned int task_cpu(const struct task_struct *p)
2246 {
2247 return 0;
2248 }
2249
set_task_cpu(struct task_struct * p,unsigned int cpu)2250 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2251 {
2252 }
2253
2254 #endif /* CONFIG_SMP */
2255
2256 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2257
2258 #ifdef CONFIG_TRACING
2259 extern void
2260 __trace_special(void *__tr, void *__data,
2261 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2262 #else
2263 static inline void
__trace_special(void * __tr,void * __data,unsigned long arg1,unsigned long arg2,unsigned long arg3)2264 __trace_special(void *__tr, void *__data,
2265 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2266 {
2267 }
2268 #endif
2269
2270 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2271 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2272
2273 extern void normalize_rt_tasks(void);
2274
2275 #ifdef CONFIG_GROUP_SCHED
2276
2277 extern struct task_group init_task_group;
2278 #ifdef CONFIG_USER_SCHED
2279 extern struct task_group root_task_group;
2280 extern void set_tg_uid(struct user_struct *user);
2281 #endif
2282
2283 extern struct task_group *sched_create_group(struct task_group *parent);
2284 extern void sched_destroy_group(struct task_group *tg);
2285 extern void sched_move_task(struct task_struct *tsk);
2286 #ifdef CONFIG_FAIR_GROUP_SCHED
2287 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2288 extern unsigned long sched_group_shares(struct task_group *tg);
2289 #endif
2290 #ifdef CONFIG_RT_GROUP_SCHED
2291 extern int sched_group_set_rt_runtime(struct task_group *tg,
2292 long rt_runtime_us);
2293 extern long sched_group_rt_runtime(struct task_group *tg);
2294 extern int sched_group_set_rt_period(struct task_group *tg,
2295 long rt_period_us);
2296 extern long sched_group_rt_period(struct task_group *tg);
2297 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2298 #endif
2299 #endif
2300
2301 extern int task_can_switch_user(struct user_struct *up,
2302 struct task_struct *tsk);
2303
2304 #ifdef CONFIG_TASK_XACCT
add_rchar(struct task_struct * tsk,ssize_t amt)2305 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2306 {
2307 tsk->ioac.rchar += amt;
2308 }
2309
add_wchar(struct task_struct * tsk,ssize_t amt)2310 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2311 {
2312 tsk->ioac.wchar += amt;
2313 }
2314
inc_syscr(struct task_struct * tsk)2315 static inline void inc_syscr(struct task_struct *tsk)
2316 {
2317 tsk->ioac.syscr++;
2318 }
2319
inc_syscw(struct task_struct * tsk)2320 static inline void inc_syscw(struct task_struct *tsk)
2321 {
2322 tsk->ioac.syscw++;
2323 }
2324 #else
add_rchar(struct task_struct * tsk,ssize_t amt)2325 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2326 {
2327 }
2328
add_wchar(struct task_struct * tsk,ssize_t amt)2329 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2330 {
2331 }
2332
inc_syscr(struct task_struct * tsk)2333 static inline void inc_syscr(struct task_struct *tsk)
2334 {
2335 }
2336
inc_syscw(struct task_struct * tsk)2337 static inline void inc_syscw(struct task_struct *tsk)
2338 {
2339 }
2340 #endif
2341
2342 #ifndef TASK_SIZE_OF
2343 #define TASK_SIZE_OF(tsk) TASK_SIZE
2344 #endif
2345
2346 #ifdef CONFIG_MM_OWNER
2347 extern void mm_update_next_owner(struct mm_struct *mm);
2348 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2349 #else
mm_update_next_owner(struct mm_struct * mm)2350 static inline void mm_update_next_owner(struct mm_struct *mm)
2351 {
2352 }
2353
mm_init_owner(struct mm_struct * mm,struct task_struct * p)2354 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2355 {
2356 }
2357 #endif /* CONFIG_MM_OWNER */
2358
2359 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2360
2361 #endif /* __KERNEL__ */
2362
2363 #endif
2364